linux获取文件属性错误

[banmiton]

通过lstat和fstat函数获取文件的最后访问时间和最后修改时间以及最后改变时间，获取的时间和文件通过ls -l命令查看的时间不一致，请问各位大侠，这个可能是什么原因导致？

[_了凡_]

那就给你看段ls的源码中对于时间的处理部分，自己对照下：

static int listfile_long(const char *path, int flags)
{
    struct stat s;
    char date[32];
    char mode[16];
    char user[16];
    char group[16];
    const char *name;

    /* name is anything after the final '/', or the whole path if none*/
    name = strrchr(path, '/');
    if(name == 0) {
        name = path;
    } else {
        name++;
    }

    if(lstat(path, &s) < 0) {
        return -1;
    }

    mode2str(s.st_mode, mode);
    user2str(s.st_uid, user);
    group2str(s.st_gid, group);
    // 看到这个了，如此处理的……
    strftime(date, 32, "%Y-%m-%d %H:%M", localtime((const time_t*)&s.st_mtime));
    date[31] = 0;
    
// 12345678901234567890123456789012345678901234567890123456789012345678901234567890
// MMMMMMMM UUUUUUUU GGGGGGGGG XXXXXXXX YYYY-MM-DD HH:MM NAME (->LINK)

    switch(s.st_mode & S_IFMT) {
    case S_IFBLK:
    case S_IFCHR:
        printf("%s %-8s %-8s %3d, %3d %s %s\n",
               mode, user, group, 
               (int) MAJOR(s.st_rdev), (int) MINOR(s.st_rdev),
               date, name);
        break;
    case S_IFREG:
        printf("%s %-8s %-8s %16llu %s %s\n",
               mode, user, group, s.st_size, date, name);
        break;
    case S_IFLNK: {
        char linkto[256];
        int len;

        len = readlink(path, linkto, 256);
        if(len < 0) return -1;
        
        if(len > 255) {
            linkto[252] = '.';
            linkto[253] = '.';
            linkto[254] = '.';
            linkto[255] = 0;
        } else {
            linkto[len] = 0;
        }
        
        printf("%s %-8s %-8s                    %s %s -> %s\n",
               mode, user, group, date, name, linkto);
        break;
    }
    default:
        printf("%s %-8s %-8s                    %s %s\n",
               mode, user, group, date, name);

    }
    return 0;
}

[qq120848369]

没观察过，atime,mtime,ctime，就这么三个东西,ls 默认是修改时间mtime吧，记不清了。ls -la ls -lc看其他两个时间，。

[Linux-Torvalds]

你的ls命令是如何用的？
还有你的代码是对st_atime,st_ctime,st_mtime是如何处理的？

[linux_6]

static int listfile_long(const char *path, int flags) { struct stat s; char date[32]; char mode[16]; char user[16]; char group[16]; const char *name; /* name is anything after the final '/', or the whole path if none*/ name = strrchr(path, '/'); if(name == 0) { name = path; } else { name++; } if(lstat(path, &s) < 0) { return -1; } mode2str(s.st_mode, mode); user2str(s.st_uid, user); group2str(s.st_gid, group); // 看到这个了，如此处理的…… strftime(date, 32, "%Y-%m-%d %H:%M", localtime((const time_t*)&s.st_mtime)); date[31] = 0; // 12345678901234567890123456789012345678901234567890123456789012345678901234567890 // MMMMMMMM UUUUUUUU GGGGGGGGG XXXXXXXX YYYY-MM-DD HH:MM NAME (->LINK) switch(s.st_mode & S_IFMT) { case S_IFBLK: case S_IFCHR: printf("%s %-8s %-8s %3d, %3d %s %s\n", mode, user, group, (int) MAJOR(s.st_rdev), (int) MINOR(s.st_rdev), date, name); break; case S_IFREG: printf("%s %-8s %-8s %16llu %s %s\n", mode, user, group, s.st_size, date, name); break; case S_IFLNK: { char linkto[256]; int len; len = readlink(path, linkto, 256); if(len < 0) return -1; if(len > 255) { linkto[252] = '.'; linkto[253] = '.'; linkto[254] = '.'; linkto[255] = 0; } else { linkto[len] = 0; } printf("%s %-8s %-8s %s %s -> %s\n", mode, user, group, date, name, linkto); break; } default: printf("%s %-8s %-8s %s %s\n", mode, user, group, date, name); } return 0; }